Electronic Yarn Clearing and Defect Classification
topic
Electronic yarn clearers using capacitance or optical sensors continuously measure yarn mass or diameter at 200 to 600 metres per minute, classifying detected faults against USTER classimat fault classification matrix defining thin places, thick places, short and long thick faults, and neps by their cross-section deviation and length, triggering cutting at faults above programmed sensitivity thresholds set to remove defects causing fabric appearance problems while avoiding excessive cuts that reduce winding efficiency.
Role
Removes the yarn faults that would cause warp breaks at heddle and reed contact during weaving and fabric appearance defects in finished cloth, with clearer sensitivity setting being the critical optimisation determining whether warp quality adequately improves weaving efficiency to justify the winding efficiency cost of cutting frequency, requiring systematic correlation between clearer fault data and weaving performance to identify the sensitivity thresholds providing optimum total process efficiency.